I'm chucking in a bit of bike work now as well, I do a 2.5 mile run 3 times a week when I get home from work, its all I can stand on the pavements without my shins playing havoc. I dont know if its poor stretching or something else causing it but I'm hoping adding my work ride in will help. I do the last 10miles in on my bike so thats 40 miles a week, when I was doing this before the clocks went back I could feel the difference after just a week or so. Heres hoping!
Being a newbie on the fells I can do with all the stamina I can muster! :)